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A program for the Bayesian estimation of phylogeny

Bayesian inference of phylogeny is based upon a quantity called the posterior
probability distribution of trees, which is the probability of a tree
conditioned on the observations. The conditioning is accomplished using
Bayes's theorem. The posterior probability distribution of trees is
impossible to calculate analytically; instead, MrBayes uses a simulation
technique called Markov chain Monte Carlo (or MCMC) to approximate the
posterior probabilities of trees.
Homepage: http://mrbayes.csit.fsu.edu/